How close do peloton riders typically and strategically follow each other's wheel/attack? Also, how is this distance manipulated in order to allow for strategic movements or a more aerodynamic ride.
2I’m not sure I fully understand the question do you mean how close to the wheel in front do they ride? Or how closely do they follow their rivals wheel, for example if someone attacks how quickly/closely do they follow that wheel/attack. And when you say “the peloton ‘gap’” are you referring to the gap between the peloton and the breakaway in a race?– EdhSep 15, 2019 at 10:00
4They ride dangerously close to each other.– MaxSep 15, 2019 at 12:21
Yes I meant how close do they follow that wheel/attack.– aitíaSep 15, 2019 at 13:34
3how close do they follow that wheel/attack As close as they can. Sometimes too close. (That guy should never have been in a race - waaaay too squirrelly. And it might look like we were going pretty slow, but that's from the wide-angle view. That crash probably happened at about 25 mph.)– Andrew HenleSep 15, 2019 at 14:38
2@AndrewHenle Cat 3/4/5 is always a minefield, Cat 1/2 is only marginally better. I got bumped and rubbed far more often in 1/2, but these typically didn't end in crashes like it would in 3/4/5. Your video reminded me the derogatory "road crayons" comment that "elites" often used for the lower category... its mean, inappropriate, but here it is surprisingly descriptive.– Rider_XSep 17, 2019 at 16:28
How close do peloton riders typically and strategically follow each other's wheel/attack?
At the higher levels of racing you are often try to tuck your wheel as close as you you can stand, usually within about 2 inches of the rider in front, depending on how much you trust the rider in front. If you know they are sketchy you will allow more room to compensate for their instability.
How tightly you draft also depends on where you are in the peloton. The front of the peloton is always the most stable, making it easier to draft tightly, while in the latter half of the peloton you suffer from things such as the accordion effect where changes in speed at the front of the peloton become amplified as it propagates backwards in peloton. This can make it harder to draft closer, but you also have a much bigger draft effect (see details below) so you don't need to draft as tightly as in the front of the peloton.
Also, how is this distance manipulated in order to allow for strategic movements or a more aerodynamic ride.
Strategic movements are often trying to break the draft, see How to prevent drafting?
Getting more aerodynamic means either getting tighter to the rider in front or ensuring you have a number of riders in front and to the sides of you to maximize your draft. A recent study showed that the draft in the belly of the peloton can be enormous, below is an excerpt from their results section discussing of their wind tunnel testing of quarter scale models with force transducers. They estimated cyclists in the belly of the peloton experience a 90% reduction in drag (i.e., 10% of the drag as a solo cyclist)
Fig. 13 shows the measurement results for the nine cyclists in terms of percentage drag of that of an isolated rider at the same speed, i.e. the quarter-scale wind tunnel model tested at 26.7 m/s. It is shown that all nine cyclists benefit from riding in the peloton, even the leading rider (R1), who experiences a drag reduction down to 84% that of the isolated rider. This is caused by the subsonic upstream disturbance by the 120 cyclists drafting in his/her wake. When moving downstream in the peloton, the drag rapidly decreases. Rider R3 only has 35% of the drag of the isolated rider. This value corresponds quite well to that of the trailing rider in Fig. 9b considering that (i) rider R3 has an additional benefit by the 116 riders drafting behind him/her and (ii) the diamond configuration has a larger spacing between the rows than Peloton A. The last four riders, R11 to R17, have a drag force that is below 10% that of the isolated rider.
Figure. 13. Results from wind tunnel measurements: drag of the nine cyclists in the vertical centerplane as a percentage of the drag of an isolated cyclist riding at the same speed.
-- Aerodynamic drag in cycling pelotons: New insights by CFD simulation and wind tunnel testing
While you can get a massive draft in the belly of the peloton, the drawback is that you will not be able to respond quickly to attacks due to there being layers of several riders between you and the open road. As such, a breakaway group could easily form while you are stuck back in the peloton. If the break turns out to be the decisive race maneuver, then it didn't matter how much energy you were saving as you missed the critical opportunity.
Strong riders therefore will often sacrifice a bit of energy savings to ride near the front of the peloton so that they can control the race and respond to attacks. While minimizing energy expenditure can be important, it is one of may factors that need to be optimize simultaneously. A racer just need enough reserves to cross the finish line, anything extra was wasted!
1Thank you for providing supportive data.– aitíaSep 17, 2019 at 19:12
The length of the drafting benefit increases with the speed of the cyclist and the size of the cyclist in front. Even at 5 meters there is significant benefit for the rider behind. However what increases significantly as the distance goes from 1meter to 10cm is the benefit to the leading rider by having a rider behind him. So the closer you ride, the faster the lead rider can go at the same power. In effect the second rider becomes a "tail" that allows the flow to detach cleanly and reduces the drag for the leading rider.
Recent studies show that significant drag reduction happens at up 20 meters behind the leading rider in ideal conditions.